[Ulzgoroth]

In many settings (Star Wars emphatically included) almost all capital ship weapons are turrets (and thus are best located in the middle in Spaceships so that they have a totally unrestricted field of fire) or are missile (torpedo, whatever name) launchers which can engage in any direction from any position (under SS3 rules, not SS1).

Running out of places to install weapons for the fields of fire you want (as opposed to not having the slots anywhere) is pretty unusual in Spaceships, I think. And if you do, your problem is most likely to be with rear-firing due to thrusters taking up slots. I don't really see how you could make a tradeoff that improves forward fire coverage in any useful way.